public class BooleanFn extends SystemFunctionCall implements Negatable, Callable
operationargumentEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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BooleanFn() |
| Modifier and Type | Method and Description |
|---|---|
Sequence |
call(XPathContext c,
Sequence[] arguments)
Call the Callable.
|
void |
checkArguments(ExpressionVisitor visitor)
Static analysis: prevent sorting of the argument
|
boolean |
effectiveBooleanValue(XPathContext c)
Evaluate the effective boolean value
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BooleanValue |
evaluateItem(XPathContext context)
Evaluate the function
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ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the BooleanFn expression
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boolean |
isNegatable(ExpressionVisitor visitor)
Check whether this specific instance of the expression is negatable
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Expression |
negate()
Create an expression that returns the negation of this expression
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Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions.
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static Expression |
rewriteEffectiveBooleanValue(Expression exp,
ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Optimize an expression whose effective boolean value is required.
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addContextDocumentArgument, addDocToPathMap, bindStaticContext, computeCardinality, computeSpecialProperties, copy, equalOrNull, equals, getContextNode, getConvertingCallable, getDefaultArgumentNode, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getImplementationMethod, getItemType, getOperation, getRequiredType, iterateSubExpressionInfo, makeSystemFunction, setDetails, useContextItemAsDefaultaddExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString, typeCheckaddToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, typeErrorpublic void checkArguments(ExpressionVisitor visitor) throws XPathException
checkArguments in class SystemFunctionCallvisitor - the expression visitorXPathException - if the arguments are incorrectpublic Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
optimize in class SystemFunctionCallvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public boolean isNegatable(ExpressionVisitor visitor)
isNegatable in interface Negatablepublic Expression negate()
public static Expression rewriteEffectiveBooleanValue(Expression exp, ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
exp - the expression whose EBV is to be evaluatedvisitor - an expression visitorcontextItemType - the type of the context item for this expressionXPathException - if static errors are foundpublic BooleanValue evaluateItem(XPathContext context) throws XPathException
evaluateItem in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic boolean effectiveBooleanValue(XPathContext c) throws XPathException
effectiveBooleanValue in class Expressionc - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic Sequence call(XPathContext c, Sequence[] arguments) throws XPathException
Callablecall in interface Callablec - the dynamic evaluation contextarguments - the values of the arguments, supplied as Sequences.
Generally it is advisable, if calling iterate() to process a supplied sequence, to
call it only once; if the value is required more than once, it should first be converted
to a GroundedValue by calling the utility methd
SequenceTool.toGroundedValue().
If the expected value is a single item, the item should be obtained by calling
Sequence.head(): it cannot be assumed that the item will be passed as an instance of
Item or AtomicValue.
It is the caller's responsibility to perform any type conversions required to convert arguments to the type expected by the callee. An exception is where this Callable is explicitly an argument-converting wrapper around the original Callable.
XPathException - if a dynamic error occurs during the evaluation of the expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class ExpressionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.